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Q331.
List-I (Skeleton Type)
List-II (Animal Group)
(a) Spicules or spongin fibres
i) Corals (Cnidaria)
(b) Calcium carbonate skeleton
ii) Chondrichthyes
(c) Chitinous exoskeleton
iii) Porifera
(d) Cartilaginous endoskeleton
iv) Arthropoda
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Sponges (Porifera) supported by spicules or spongin fibres. Some cnidarians (corals) have calcium carbonate skeletons. Arthropods have chitinous exoskeletons. Chondrichthyes possess a cartilaginous endoskeleton.
Q332.
List-I (Term)
List-II (Phylum)
(a) Collar cells (Choanocytes)
i) Echinodermata
(b) Comb plates
ii) Hemichordata
(c) Proboscis
iii) Porifera
(d) Calcareous ossicles
iv) Ctenophora
[Animal-Kingdom] [class-xi]
Correct option: C [ C ]
Remark: Collar cells (choanocytes) line the spongocoel in Porifera. Comb plates are used for locomotion in Ctenophora. A proboscis, collar and trunk division is characteristic of Hemichordata. Calcareous ossicles form the endoskeleton of Echinodermata.
iii) Marine, but migrate to fresh water for spawning
(d) Ctenophora
iv) Exclusively marine, bioluminescent
[Animal-Kingdom] [class-xi]
Correct option: C [ C ]
Remark: Cyclostomes (e.g., lampreys) are marine and migrate to fresh water for spawning. Reptiles are mostly terrestrial with creeping/crawling locomotion. Amphibia have a dual life (aquatic larval stage and terrestrial adult). Ctenophora are exclusively marine and often bioluminescent.
Q334.
List-I (Organisation)
List-II (Example Phylum)
(a) Diploblastic, tissue level
i) Annelida
(b) Triploblastic, organ level, acoelomate
ii) Porifera
(c) Triploblastic, organ-system, pseudocoelomate
iii) Platyhelminthes
(d) Cellular level
iv) Aschelminthes
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Coelenterata are diploblastic and at tissue level (diploblastic: ectoderm + endoderm). Platyhelminthes are triploblastic, organ level, and acoelomate. Aschelminthes are triploblastic, organ-system level and pseudocoelomate. Porifera exhibit cellular level organisation.
iii) Body is cylindrical and worm-like (no shell/exoskeleton)
(d) Hemichordata
iv) Chitinous exoskeleton
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Mollusca: body often covered by calcareous shell. Arthropoda: chitinous exoskeleton. Echinodermata: endoskeleton of calcareous ossicles. Hemichordata: worm-like body without shell or exoskeleton.
Q339.
List-I (Term)
List-II (Group)
(a) Hermaphrodite (Monoecious)
i) Aschelminthes
(b) Separate sexes (Dioecious)
ii) Porifera
(c) Asexual reproduction by fragmentation
iii) Reptilia
(d) Oviparous with direct development
iv) Annelida (Earthworm/Leech)
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Earthworms and leeches (Annelida) are monoecious (hermaphrodite). Aschelminthes generally have separate sexes (dioecious). Porifera reproduce asexually by fragmentation. Reptilia are oviparous with direct development.